For a bargain basement card, the NVidia GT120 does not fair too badly in that Barefeats test by all accounts. Not the fastest, but certainly no slouch either it seems. The ATi 4870HD does not seem to be runaway improvement that the stats/graph on the Apple store would suggest.

MacRumors attracts a broad audience
of both consumers and professionals interested in
the latest technologies and products. We also boast an active community focused on
purchasing decisions and technical aspects of the iPhone, iPod, iPad, and Mac platforms.